Tomato early blight is also called summer blight or ringworm disease. During the rainy season, the damage to tomatoes in the protected areas and the protected areas is relatively heavy. Generally, the output is reduced by 20% to 30%, and when serious, the yield is reduced by more than 50%. High temperature and humidity are conducive to the occurrence and prevalence of the disease. The temperature in the field was 15°C, and the relative humidity was above 80%. The temperature began to rise from 20°C to 25°C, fogging or even cloudy days, and the disease developed rapidly.
Chemical control can use 64% antivirus WP 500 times, or 50% acetaminophen wettable powder 1000 times, or 70% dexamethasone wettable powder 500 times, spray once every 7 days, Even spray 3 to 4 times, with 50-60 kg of liquid per acre. If the combination of early blight and late blight occurs, a 58% metalaxyl MnZn WP can be used 500 times. If there is a lesion on the stem, it can be applied with 50% acetaminophen WP 200 times for better results.
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